Keeping Things in Check

(Originally posted: August 28, 2019)

We are in the dog days of summer and while it may seem like our gardening ‘to do’ list is virtually complete, there are certainly tasks to be done!

At this point in the year we have a lot of the growing season behind us- which means our plants have had many months to increase in size and fill-in. I know it sounds crazy, but this can be a problem when it comes to some plants and now is a great time to address excessive growth and keep things in check.

Take groundcovers for example…

Groundcovers are great. They are perfect filler plants in the garden, great for edging a perennial boarder, or growing plant material in an otherwise troublesome spot. By their nature they are supposed to spread- this is why we use them! But every now and then, they need a gentle reminder that they are not the ‘be-all-end-all’ in the garden. It’s kind of a “I love you but…” conversation only it doesn’t need to end in tears.

Take this Lamium for example…

In this case, the conversation would go something like this…

”I love you because you are very pretty along the edge of my garden but… c’mon, do you really need to try to make a run for it out of the garden bed and into my lawn?”

Or how about this Vinca (look carefully for it)…

“I love you because you provide such a rich green evergreen carpet for me, but… do you really need to try and overtake my other babies?

And to continue the conversation with Vinca …

”I love you but… I also love the look of my hardscape. I know this rock doesn’t change with the seasons, provided any sort of greenery, or flower, but I spent a lot of money on it, I think it is pretty in its own way, and would really like to see it. Besides, it really helps to set off your beautiful green leaves and oh so pretty flowers” (In this instance, flattery helps soften the blow.)

As with most relationships, you cannot expect your partner to change… these perennials will always spread so we must work with them to keep the relationship running smoothly. Time for a bit of maintenance!

The Garden Edge

Let’s start with the ‘grass is always greener on the other side [of the garden edge]” type of groundcover. First of all, I should start by saying that if your groundcover does in fact reach your lawn, it becomes a nightmare to remove. It is so much easier to control it while it is in the garden bed. With that said, I always like to make sure there is a very distinct boundary between the leading edge of the groundcover and the edge of the bed- about 15 cm/6” or so. I find this strip of mulched area in front of the groundcover ensures the lines of the garden remain clear, even from a distance. Having this space also makes line-trimming of the lawn easier- no perennials to accidentally get in the way.

Freeing the Plants

Moving on to the groundcover that likes to swallow up every other plant in it’s path.

Whether you like a continuous green look to your garden bed, or you like your plants to look distinct from one another, it is important to not let your groundcovers grow over top of your other plants. Losing your other plants to an aggressive groundcover is a problem that ‘creeps’ up on you before you realize it! For this reason, occasional trimming and even pulling out groundcover from around the base of your other garden plants is generally good practice to keep your plants from being swallowed up and lost forever!

Keeping the Hardscape

Last but not least: the groudcover that picks a fight with your hardscape (which is the ‘hard’ components of your landscape such as wooden structures, patios, walkways, retaining walls, and rockery). To ensure these hard features remain ‘features’, some routine clipping is in order. You can clip a hard line if that is your preference, or you can scale back the plants and leave some to soften the edges of the hardscape. How you tackle this problem depends on your style and the look you are trying to achieve in your garden!. In the case of the Vinca overgrowing the rock, I tend to clip a hard line because new growth will soften the edges rather quickly (especially earlier in the summer when things are very actively growing).

One Final (and very important) Note

For all the tasks described above, physically removing groundcovers is often necessary. It is important that this step is done right otherwise the problem can become much worse!

When pulling groundcovers, it is VERY important to know how they spread so that they can be pulled-up or dug out accordingly. Some plants, will grow above the soil and send down roots wherever their stems make contact with the ground such as Vinca (periwinkle), Hedera helix (English ivy) and Lamium (deadnettle) . Others will will spread below the soil, and send up shoots from their ‘root system’ such as Pachysandra (Japanese spurge) and Convallaria majalis (lily-of-the-valley). While this is a highly generalized description of groundcover growth (this topic certainly warrants a dedicated post) I think it gives you the basic idea- groundcovers are really really good at sending out roots and shoots from various points along their stems/roots.

What does this mean for effective groundcover removal? Leave no piece behind! Roots and shoots must be completely removed for a groundcover to be removed from an area of your garden (in some instances, you may need to dig down close to 15 centimetres to remove all the roots!) Just know that any pieces left behind both above and below the soil are eligible to sprout into ‘new’ plants.

So… it’s time to look at your garden with a critical eye- look for those sneaky plants that are trying to take-over areas that they shouldn’t, inspect how they grow both above and below the ground and then give them a little reminder that you love them… but they need to play nice with the rest of the garden so that everyone can be happy!

Deadheading Technique #2: The Haircut

(Originally posted: July 27, 2019)

We are still in the thick of summer deadheading- the constant attempt to tidy perennials, prolong their bloom or encourage a repeat bloom (depending on the perennial). If you like non-precise gardening tasks, this type of deadheading is for you! I call it ‘the haircut’ but it is also called shearing.

Remember our catmint (Nepeta) friends?

Well here are the three amigos again; one plant has already been sheared (a week prior to taking this photo), and two are still waiting in the foyer, reading their magazines, patiently waiting for the hairstylist (me)… who is taking her sweet time in completing the task!

I am going to keep this super easy: this deadheading technique involves grabbing a handful of stems and cutting them shorter. If there is new growth emerging from the base of the plant, you will want to avoid cutting this growth- it will be responsible for rejuvenating your plant! Once everything has been cut back, you can shape the clump if you wish. It really doesn’t get simpler than that! You can use secateurs for this task or hedge shears. I find hedge shears make a much bigger mess that requires cleaning (unless a drop sheet is put down first… something that I am known to do). I also find that I have much less control over the finished product with hedge shears so secateurs are certainly my ‘go to’ for this type of work.

Back to the task at hand…

Here are a couple photos of the finished ‘catmint project’. If you are thinking that the newly sheared plants look horrible, you would be correct. With that said, all you have to do is look at the middle plant to see how much better the plants will look in one short week. Also note how the clumps have been shaped to be slightly ‘dome-shaped’. I do this because I find it looks tidier overall.

Let’s do one more example of shearing… this time it is Geranium getting the haircut. In this case, the new growth coming up from the centre is left untouched- with this new growth, the plants will fill-in in no time!

If this method of ‘whacking things back’ is a little too crude for your liking, you can always cut each stem individually to a point just above a leaf (also called a node). It is from this point that the plant will branch and send out new growth. I tend to do this for Salvia spp. so that I don’t end up with unsightly ‘chopped-up’ leaves that are left on the plant; for larger-leaved perennials like Salvia, I find that looks especially bad! This plant tends to reach a point in the growing season where the removal of spent flowers to lateral flower buds (next post!) starts to make the plant look funny. Taking down the stems helps provide a reset.

Here are some common perennials that can be sheared:

• Cranesbill (Geranium spp).- the ones that get long and sprawling after flowering; spreading/dwarf varieties do not get sheared. If your Geranium is rambling over-top of other perennials, it is eligible to be sheared!

• Oriental poppy (Papaver orientalis)- cut to the ground including foliage

• Thread-leaf tickseed (Coreopsis verticillata)- when there are more spent flowers clinging to the plant than nice ones, it is time to give the plant a light shearing

• Spurge (Euphorbia spp.)- CAUTION! The milky sap that comes from the cut ends of this plant is an irritant to skin and eyes. Be sure to wear gloves, long sleeves, and eye protection. Euphorbias also harmful if eaten.

• Lavender (Lavandula spp.)

• Artemesia spp.

So there you have it! Quite possibly the simplest gardening task that can really clean-up the look of your perennials. Get out those hedge shears or secateurs and let the make-overs begin!

Deadheading Technique #1: Leave no Evidence!

(Originally posted: July 19, 2019)

Well the time has come for daylilies (Hemerocallis spp.) to shine…blooms of all sorts of colours rising above their grassy foliage. Then, just as quickly as they begin to shine, they start to ‘un-shine’ (if this is not a word, I would like to propose it as a new one). Afterall, Hemerocallis translates to ‘beautiful for a day’. These perennials look SO MUCH better when they are deadheaded to the point that, when I walk by a property with daylilies that haven’t been deadheaded, it takes everything in me to not pull out some pruners and get to work. I’ve even gone through the conversation in my head:

‘Hey! What are you doing?!’

’Your daylilies don’t look very pretty and they are begging to be tidied up. Plus this is free labour!’

’I don’t really care. Get off my property and please don’t come back.’

’OK. Sorry.’ (Said while thinking: ‘you really should care because they really don’t look very good’)

…as the inner dialogue never ends up with a positive outcome, I decide not to trespass.

Now that we established that your daylilies will likely NOT be miraculously tidied by a crazy gardener, it means you should learn the techniques so you can do the work yourself!

There are a few steps to tidying daylilies. The first step is done during the bloom period. Old withered flowers are removed, as are the seed capsules. Be careful not to confuse the seed pods with flower buds. In general, seed pods are more roundish and flower buds are elongated. Once you have identified the parts to be removed, tidying the plant is easy! The withered flowers and seed pods simply snap off by hand.

A daylily with lots of flower buds and a seed pod (circled in red).

Once the last flower has faded from a particular flower stalk we move on to the next step of tidying up the plant. This is perhaps the easiest deadheading technique which I term the ‘leave no evidence’ approach, otherwise known as cutting back the whole flower stem. Essentially you are removing the entire stem to a point below the foliage- removing all evidence that the plant ever had flowers. It is a technique used for daylilies, hosta, iris, coral bells, scabiosa among others.

A before and after look at a hosta in need of deadheading. The photo on the right is of a hosta breathing a sigh of relief that it’s unsightly spent flowers have been removed… or maybe that was my sigh of relief.

So have a look at your garden- if you see any of these common landscape plants with spent flowers still clinging to them, do your plants a favour and give them a little facelift… with some simple deadheading!